SP490CN-L RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The SP490CN-L is a full-duplex RS422/RS485 transceiver manufactured by MaxLinear, Inc., housed in an 8-SOIC surface mount package. This device operates at 5V supply voltage with a 5 Mbps data rate and is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts from active product lines are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	SP490CN-L
Manufacturer	MaxLinear, Inc.
Protocol	RS422, RS485
Duplex Configuration	Full
Number of Drivers/Receivers	1/1
Receiver Hysteresis	70 mV
Data Rate	5 Mbps
Supply Voltage	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SP490CN-L is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Protocol: RS422/RS485 full-duplex operation
Package: 8-SOIC form factor (0.154", 3.90mm Width)
Duplex: Full-duplex configuration
Driver/Receiver Count: 1/1 topology
Mounting Type: Surface Mount

Performance Parameters (Allowable Variance):

Data Rate: Substitute must support minimum 5 Mbps; higher rates are acceptable
Receiver Hysteresis: Substitute range 30 mV to 70 mV is acceptable
Supply Voltage: Substitute must support 4.75V ~ 5.25V range or broader compatible range
Operating Temperature: Substitute must support minimum 0°C ~ 70°C; extended ranges are acceptable

Substitute parts are grouped into two categories based on supply voltage compatibility:

Category A (5V Supply Compatible): ADM1490EBRZ, ADM1490EBRZ-REEL7, ISL8490EIBZ, ISL8490EIBZ-T

Category B (3V Supply Compatible): ADM3490ARZ, ADM3490ARZ-REEL7, ADM3490EARZ, ADM3490EARZ-REEL7, ISL83490IBZ, ISL83490IBZ-T

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Hysteresis (mV)	Data Rate (Mbps)	Supply Voltage	Temp Range (°C)	Package	Status	Packaging Type
SP490CN-L	MaxLinear, Inc.	RS422, RS485	1/1	Full	70	5	4.75V ~ 5.25V	0 ~ 70	8-SOIC	Obsolete	—
ADM1490EBRZ	Analog Devices Inc.	RS422, RS485	1/1	Full	30	16	4.75V ~ 5.25V	-40 ~ 85	8-SOIC	Active	Tube
ADM1490EBRZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	Full	30	16	4.75V ~ 5.25V	-40 ~ 85	8-SOIC	Active	Tape & Reel (TR)
ADM3490ARZ	Analog Devices Inc.	RS422, RS485	1/1	Full	50	10	3V ~ 3.6V	-40 ~ 85	8-SOIC	Active	Tube
ADM3490ARZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	Full	50	10	3V ~ 3.6V	-40 ~ 85	8-SOIC	Active	Cut Tape (CT) & Digi-Reel®
ADM3490EARZ	Analog Devices Inc.	RS422, RS485	1/1	Full	50	10	3V ~ 3.6V	-40 ~ 85	8-SOIC	Active	Tube
ADM3490EARZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	Full	50	10	3V ~ 3.6V	-40 ~ 85	8-SOIC	Active	Cut Tape (CT) & Digi-Reel®
ISL83490IBZ	Renesas Electronics Corporation	RS422, RS485	1/1	Full	50	10	3V ~ 3.6V	-40 ~ 85	8-SOIC	Active	Tube
ISL83490IBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	Full	50	10	3V ~ 3.6V	-40 ~ 85	8-SOIC	Active	Cut Tape (CT) & Digi-Reel®
ISL8490EIBZ	Renesas Electronics Corporation	RS422, RS485	1/1	Full	70	10	4.5V ~ 5.5V	-40 ~ 85	8-SOIC	Active	Tube
ISL8490EIBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	Full	70	10	4.5V ~ 5.5V	-40 ~ 85	8-SOIC	Active	Tape & Reel (TR)

Engineering Selection Recommendations

For 5V Supply Designs (Direct Voltage Compatibility):

ADM1490EBRZ and ADM1490EBRZ-REEL7 are active Analog Devices products with ROHS3 compliance and REACH unaffected status. These parts maintain the 4.75V ~ 5.25V supply voltage range of the SP490CN-L while providing enhanced performance (16 Mbps data rate) and extended operating temperature range (-40°C ~ 85°C). The ADM1490EBRZ-REEL7 variant is supplied in Tape & Reel format for high-volume production.

ISL8490EIBZ and ISL8490EIBZ-T are active Renesas products with matching 70 mV receiver hysteresis and 5V-compatible supply range (4.5V ~ 5.5V). These parts offer ROHS3 compliance and extended temperature operation. The ISL8490EIBZ-T variant is supplied in Tape & Reel format.

For 3V Supply Designs (Alternative Voltage Domain):

ADM3490 series (ARZ, ARZ-REEL7, EARZ, EARZ-REEL7) and ISL83490 series (IBZ, IBZ-T) are active products designed for 3V ~ 3.6V operation. All variants carry ROHS3 compliance and REACH unaffected status. The ADM3490 and ISL83490 families provide 10 Mbps data rate with 50 mV receiver hysteresis and extended temperature range (-40°C ~ 85°C). Packaging options include Tube, Cut Tape & Digi-Reel®, and Tape & Reel formats.

Product Status Consideration:

All substitute parts listed are active products with established supply chains and ongoing manufacturer support, contrasting with the obsolete status of SP490CN-L.

Frequently Asked Questions (FAQ)

Q: Can ADM1490EBRZ directly replace SP490CN-L in existing designs?

A: Yes, for designs operating at 5V supply. Both parts share the 4.75V ~ 5.25V supply voltage range, 8-SOIC package, and full-duplex RS422/RS485 protocol. The ADM1490EBRZ provides higher data rate (16 Mbps vs. 5 Mbps) and extended temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C). Receiver hysteresis differs (30 mV vs. 70 mV), which may affect noise margin in specific applications.

Q: What is the difference between ADM1490EBRZ and ADM1490EBRZ-REEL7?

A: Both parts are electrically identical. The difference is packaging format: ADM1490EBRZ is supplied in Tube packaging, while ADM1490EBRZ-REEL7 is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for high-volume automated assembly.

Q: Why are there 3V supply alternatives (ADM3490, ISL83490) listed for a 5V part?

A: The 3V alternatives are functionally equivalent in protocol, package, and topology but operate in a different voltage domain. These are listed as substitutes for designs that can accommodate 3V supply operation or for new designs not constrained to 5V. They are not direct drop-in replacements for existing 5V circuits without power supply modification.

Q: What does "ROHS3 Compliant" mean for substitute selection?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the part meets EU environmental standards for hazardous substance restrictions. All active substitute parts listed carry ROHS3 compliance, ensuring regulatory alignment with modern manufacturing and environmental requirements.

Q: Are ISL8490EIBZ and ISL83490IBZ interchangeable?

A: No. ISL8490EIBZ operates at 4.5V ~ 5.5V supply with 70 mV hysteresis. ISL83490IBZ operates at 3V ~ 3.6V supply with 50 mV hysteresis. These are distinct product lines for different voltage domains and are not interchangeable without circuit modification.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences?

A: SP490CN-L carries MSL 1 (Unlimited), indicating no moisture sensitivity constraints. Substitute parts from Analog Devices carry MSL 1, while Renesas parts carry MSL 3 (168 Hours). MSL 3 requires controlled storage and handling procedures to prevent moisture absorption during storage and before reflow soldering. This affects supply chain logistics and component shelf life management.

Q: Can I use ISL83490IBZ-T in place of ISL8490EIBZ-T?

A: No. ISL83490IBZ-T is a 3V product (3V ~ 3.6V), while ISL8490EIBZ-T is a 5V product (4.5V ~ 5.5V). Voltage domain compatibility is mandatory; these parts cannot be substituted for each other without power supply redesign.

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